linux-kernel - Re: [PATCH 0/8] Suspend block api (version 6)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 5 May 2010 20:52:50 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Brian Swetland <swetland@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Arve Hj?nnev?g <arve@...roid.com>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Paul Walmsley <paul@...an.com>, magnus.damm@...il.com,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>, rebecca@...roid.com
Subject: Re: [PATCH 0/8] Suspend block api (version 6)

On Wed, May 05, 2010 at 08:22:08PM +0100, Matthew Garrett wrote:
> On Wed, May 05, 2010 at 03:13:52PM -0400, Alan Stern wrote:

> > Does it know when a call is in progress?

> Perhaps you could infer that from the audio routing setup? I don't know 
> enough about embedded codecs.

Yes, you can providing we extract a bit more information from the
machine drivers and/or userspace - we already do our power management
based on paths.  The implementation I'd do here is to provide a facility
for marking some of the path endpoints as suspend insensitive then on
suspend leave those endpoints in their current state, force the other
endpoints off temporarily and re-run the standard power checks.

One thing I'll need to have a bit of a think about is if we need to
provide the ability to offer control to userspace for the suspend state
of path endpoints separately to their runtime state; I suspect the
answer is yes.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/